reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ccfedb0a2f5cbe99e74cc676d316f35195e82f90
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tzung-Bi-Shih/char-misc-Simplify-locking-with-guard/20260427-231042
        git checkout ccfedb0a2f5cbe99e74cc676d316f35195e82f90

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/